The SX500-LG only has a bad rep here though. Pretty much every reviewer, even SPCR, gave it the thumbs up.
Not to say that the SX500-LG couldn't be improved, but it's good enough for most people.
Dangit Silverstone, you have your own perfectly good 120mm slim fan! Stop using that POS now you're not locked into a tiny voltage range!
IIRC, the fan itself works over the full votlage range, but Silverstone chose it specifically because it shut off under a certain voltage (that happened to correspond to an acceptable heatsink temperature for a chosen thermistor heatshrinked to it), and was sufficiently fast when that thermistor hit a higher temperature. The effective working range is from like 3v to 5.5/6v in the SX500-LG. It was chosen because it just happened to have the desired fan curve to match the thermistor that Sirfa installed in the PSU, making the fan a drop-in replacement. Silverstone's own slim 120mm was ruled out for having too low a starting voltage to work in semi-fanless mode with that thermistor.If I recall correctly, I believe you are confusing two PSUs. The "tiny voltage range" issue is with the Enhance-built SX600-G. The SX500-LG and other HighPower-built SFX-L designs use the full voltage range, or at least further than 3-5V
Anyway, which fan are you talking about particularly? Might be worth trying a fan swap and testing noise and temp levels. I could do that, since I did buy a temp gun and tach meter for testing last year.
Silverstone chose it specifically because it shut off under a certain voltage (that happened to correspond to an acceptable heatsink temperature for a chosen thermistor heatshrinked to it), and was sufficiently fast when that thermistor hit a higher temperature. The effective working range is from like 3v to 5.5/6v in the SX500-LG.
The effective working range is from like 3v to 5.5/6v in the SX500-LG.
I guess it could be pushed higher with a higher ambient temperature. It's still far from using the full fan range, and still constrained by the thermistor.6V? That would be around 1100rpm max according to Aiboh's chart.
However, the chart on Silverstone's product page indicates the fan goes up to almost 1500rpm which would be more like 9V according to the chart. Since Aiboh measured with no resistance / unimpeded airflow, then the actual max would be a little higher.
Looking for a SFX psu for a Skylake 6700K, z170itx, AMD Nano build. At what powerdraw does the switching occur at normal room temperature? Would the system be "clicking" when doing desktop work?
There really isn't any drawback. In theory the system won't be running at the PSU's sweet spot for efficiency but it'll be platinum rated so it'll still be fairly efficient even at low load.
I'd like to see graphs of waste heat vs. load (i.e. (1 - efficiency) * tested load) be more common. That gives a much better idea of the absolute heat output a given PSU is dealing with at a given load. Graphing relative percentage efficiency makes comparisons between PSUs of different absolute load ratings much harder.I've always had this idea that people mistake "most efficient at 50% load" as "least heat and noise output at 50% load, more heat and noise at lower or higher percentages than 50%".
I plugged the 110V efficiency measurements from the two Chiphell reviews into a spreadsheet and plotted efficiency and waste heat values against actual output:
The 450W unit has a slight advantage between ~50W and ~180W. The 600W unit starts pulling away after ~200W. At 360W the advantage is ~10W. 10W at 12 cents per kWh comes out to be just above $10 a year.
That's assuming 360W usage for 24/7. So the 450W is actually producing less waste heat for normal usage and costs less.
Their 970/980 review explains it fairly well, but in short, Maxwell's power draw can be very spiky even over a short amount of time.
I have a 980 running on a 300W SFX PSU. Peak load doesn't matter too much if you have a PSU that isn't terrible.